<!doctype html>

<html>
<head>
  <link rel="shortcut icon" href="static/images/favicon.ico" type="image/x-icon">
  <title>linear1_test.js (Closure Library API Documentation - JavaScript)</title>
  <link rel="stylesheet" href="static/css/base.css">
  <link rel="stylesheet" href="static/css/doc.css">
  <link rel="stylesheet" href="static/css/sidetree.css">
  <link rel="stylesheet" href="static/css/prettify.css">

  <script>
     var _staticFilePath = "static/";
     var _typeTreeName = "goog";
     var _fileTreeName = "Source";
  </script>

  <script src="static/js/doc.js">
  </script>


  <meta charset="utf8">
</head>

<body onload="grokdoc.onLoad();">

<div id="header">
  <div class="g-section g-tpl-50-50 g-split">
    <div class="g-unit g-first">
      <a id="logo" href="index.html">Closure Library API Documentation</a>
    </div>

    <div class="g-unit">
      <div class="g-c">
        <strong>Go to class or file:</strong>
        <input type="text" id="ac">
      </div>
    </div>
  </div>
</div>

<div class="clear"></div>

<h2><a href="local_closure_goog_math_interpolator_linear1_test.js.html">linear1_test.js</a></h2>

<pre class="prettyprint lang-js">
<a name="line1"></a>// Copyright 2011 The Closure Library Authors. All Rights Reserved.
<a name="line2"></a>//
<a name="line3"></a>// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);
<a name="line4"></a>// you may not use this file except in compliance with the License.
<a name="line5"></a>// You may obtain a copy of the License at
<a name="line6"></a>//
<a name="line7"></a>//      http://www.apache.org/licenses/LICENSE-2.0
<a name="line8"></a>//
<a name="line9"></a>// Unless required by applicable law or agreed to in writing, software
<a name="line10"></a>// distributed under the License is distributed on an &quot;AS-IS&quot; BASIS,
<a name="line11"></a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<a name="line12"></a>// See the License for the specific language governing permissions and
<a name="line13"></a>// limitations under the License.
<a name="line14"></a>
<a name="line15"></a>goog.provide(&#39;goog.math.interpolator.Linear1Test&#39;);
<a name="line16"></a>goog.setTestOnly(&#39;goog.math.interpolator.Linear1Test&#39;);
<a name="line17"></a>
<a name="line18"></a>goog.require(&#39;goog.math.interpolator.Linear1&#39;);
<a name="line19"></a>goog.require(&#39;goog.testing.jsunit&#39;);
<a name="line20"></a>
<a name="line21"></a>function testLinear() {
<a name="line22"></a>  // Test special case with no data to interpolate.
<a name="line23"></a>  var x = [];
<a name="line24"></a>  var y = [];
<a name="line25"></a>  var interp = new goog.math.interpolator.Linear1();
<a name="line26"></a>  interp.setData(x, y);
<a name="line27"></a>  assertTrue(isNaN(interp.interpolate(1)));
<a name="line28"></a>
<a name="line29"></a>  // Test special case with 1 data point.
<a name="line30"></a>  x = [0];
<a name="line31"></a>  y = [3];
<a name="line32"></a>  interp = new goog.math.interpolator.Linear1();
<a name="line33"></a>  interp.setData(x, y);
<a name="line34"></a>  assertRoughlyEquals(3, interp.interpolate(1), 1e-4);
<a name="line35"></a>
<a name="line36"></a>  // Test general case.
<a name="line37"></a>  x = [0, 1, 3, 6, 7];
<a name="line38"></a>  y = [0, 0, 0, 0, 0];
<a name="line39"></a>  for (var i = 0; i &lt; x.length; ++i) {
<a name="line40"></a>    y[i] = Math.sin(x[i]);
<a name="line41"></a>  }
<a name="line42"></a>  interp = new goog.math.interpolator.Linear1();
<a name="line43"></a>  interp.setData(x, y);
<a name="line44"></a>
<a name="line45"></a>  var xi = [0, 0.5, 1, 2, 3, 4, 5, 6, 7];
<a name="line46"></a>  var expected = [0, 0.4207, 0.8415, 0.4913, 0.1411, 0.0009, -0.1392,
<a name="line47"></a>    -0.2794, 0.657];
<a name="line48"></a>  var result = [0, 0, 0, 0, 0, 0, 0, 0, 0];
<a name="line49"></a>  for (var i = 0; i &lt; xi.length; ++i) {
<a name="line50"></a>    result[i] = interp.interpolate(xi[i]);
<a name="line51"></a>  }
<a name="line52"></a>  assertElementsRoughlyEqual(expected, result, 1e-4);
<a name="line53"></a>}
<a name="line54"></a>
<a name="line55"></a>
<a name="line56"></a>function testOutOfBounds() {
<a name="line57"></a>  var x = [0, 1, 2];
<a name="line58"></a>  var y = [2, 5, 4];
<a name="line59"></a>  var interp = new goog.math.interpolator.Linear1();
<a name="line60"></a>  interp.setData(x, y);
<a name="line61"></a>  assertRoughlyEquals(interp.interpolate(-1), -1, 1e-4);
<a name="line62"></a>  assertRoughlyEquals(interp.interpolate(4), 2, 1e-4);
<a name="line63"></a>}
<a name="line64"></a>
<a name="line65"></a>
<a name="line66"></a>function testInverse() {
<a name="line67"></a>  var x = [0, 1, 3, 6, 7];
<a name="line68"></a>  var y = [0, 2, 7, 8, 10];
<a name="line69"></a>
<a name="line70"></a>  var interp = new goog.math.interpolator.Linear1();
<a name="line71"></a>  interp.setData(x, y);
<a name="line72"></a>  var invInterp = interp.getInverse();
<a name="line73"></a>
<a name="line74"></a>  var xi = [0, 0.5, 1, 2, 3, 4, 5, 6, 7];
<a name="line75"></a>  var yi = [0, 1, 2, 4.5, 7, 7.3333, 7.6667, 8, 10];
<a name="line76"></a>  var resultX = [0, 0, 0, 0, 0, 0, 0, 0, 0];
<a name="line77"></a>  var resultY = [0, 0, 0, 0, 0, 0, 0, 0, 0];
<a name="line78"></a>  for (var i = 0; i &lt; xi.length; ++i) {
<a name="line79"></a>    resultY[i] = interp.interpolate(xi[i]);
<a name="line80"></a>    resultX[i] = invInterp.interpolate(yi[i]);
<a name="line81"></a>  }
<a name="line82"></a>  assertElementsRoughlyEqual(xi, resultX, 1e-4);
<a name="line83"></a>  assertElementsRoughlyEqual(yi, resultY, 1e-4);
<a name="line84"></a>}
</pre>


</body>
</html>
